Shaft-finishing tool



Dec. 13, 1927.

M. D. MALONEY SHAFT FINISHING TOOL Filed May 20, 1925 7 w w 3 7 Q L 5 A 6 F M v n A? 5 Z c we 2 v m B INVENTOR. VLD. Malone Bi /73f f 'ATT Patented Dec. 13, 1927.

UNITED STATES.

mcnsnn n. MALoN Y, or HONOL LU, TERRITORYOF HAWAII.

snarr-rmisnme 001..

Application filed May 20,

This invention relates to improvements in tools for finishing and refinishing shafts, crank pins, and like parts and'is especlally designed. for use in refinishing the crank shafts of engines of motor vehicles and alsofor steam engines wherein the shaft or crank pins have been worn fiat, out of round, ta-

. I pered or for any other reason are required to be trued' and refinished or reduced in diameter.

One of the objects of the invention is the provision of a tool of this type wherein the shaft or other machine element to be operated upon is firmly held from rotation entirely independently of the mounting of the cutting tool whereby the depth of cut ofthe latter may be accurately regulated and the same may be also moved in a plane perpendicular to the direction of feed for the purpose of utilizing substantially the entire area of the finishing-tool.

A further object is the provision of a finishing tool embodying'such features of construction which ensure the'abrading, .cut

ting or other tool, utilized in finishing,-re-

maining in proper relation to the bearing surfaces of the shaft or pin.

- A further object is the provision of a refinishingtoolin which one of ,thebearing faces for the shaft is constituted by an adjustabletension bar which iscapable of such adjustment as to vary pressure on the shaft and which, when adjusted to another position permits of quick and convenient detachment of the tool from the shaft. 7

In the accompanying drawing wherein an approved embodiment of the invention is illustrated, Fig. 1 is a longitudinal sectional view 40 through the finishing tool showing the same applied to use. V w

j Fig. 2 is an end elevation of the tool showing a portion of the crank shaft. I Figs. 3 and 4 are rear and edge views, re-.

spectively, ofthe guiding and feeding plate for the abrading block or cutting tool. f

Fig. 5 is a fragmentary side elevation of the tool, partly in s'ection,fillustrating the use of a cutting tool in operative relation to the shaft to be operated upon,'and replacing the abrading block illustrated in Fig.

Fig. 6 is an elevation of the cutting tool.

Fig. 7 is a similar view of a modification.

Fig. 8 is an enlarged sectional view taken on line 8-8 of Fig. 6. I

' Referring to the drawing in detail, the

1926. Serial No. 110,522.

numeral 5 is the body of the tool which isv substantially U-shaped and includes the two parallel uprights6 and 7 and the web por-, tion 8. The upright member 7 is preferably hardened so as to increase its resistance to wear, and it is'also preferably provided with a groove 7 furnishing a seat for ahar'dened steel block 7 to serve as a bearing block and; to make provisions for'renewals, or blocks of different thicknesses. The web portion 8V is recessed at 9 to accommodate a bearing block 10 having its upper surface 11 disposed obliquely to and substantially facingthe inn'er surface of the upright 7. -The top and bottom faces of the block 10 are parallel so the block may be reversed. V

A tension bar 12 is pivotally connected at one extremity to the upright 6 by a screw 13 and its opposite extremity (which is inchned upwardly from. the upright 6) is apertured and extends across and in spaced relation above the upper extremity of'the upright 7 the adjusting screw 14 being in serted in the aperture of said bar andin a threaded recess'in the upright 7, for a pur-; pose which'will hereinafter appear.

The shaft, crank pin or other cylindrical machine element 15 to be finished is pressed into the space between the uprights 6 and 7 subsequent to the removal of the screw 14 and swinging the tension bar 12 tonne side so as to allow. the insertion of said shaft in place, and said tension bar is thereafter swung to a position overlying the shaft 15, and the screw 14 is threaded into the recess in the upright 7 and turned until the deproper adjustment of the screw 14 and,.it

is clearly evident from Fig. 1 that the three 7 points of contact between the shaft 15 and the block 7 block 10 and tension bar12 are substantially equidistant and hence. acomplete bearing for said shaft is provided, preventing radial displacement in any direction. It is further evident, that duetot-he inclination of the face 11 of the bearing block 10, and the possibility of adjustment of-the tension bar 12, the finishing tool is 1 adapted for finishing shafts and pins varying to a great extent in diameter. A hollow feed screw/16 is fitted in a threaded aperture17 provided in the upright 6, and 1s provided at its outer extrenr ity with a polygonal head 18 for facilitating application thereto of a wrench. The. stem 19 of a guide and feed plate 20 extends handle 23 which depends from the web portion 8 of the body of the tool, and is fitted in a threaded aperture 24 provided. therein.

directly underneath the block 22. Thehandie 23 is of such length as to afford the necessary leverage for conveniently turning the tools bodlly about the shaft 15, for finishing the surface of the handle, orif preferred, for retaining the tool in fixed posi- 1 tion while the shaft is rotated.

' When the tool has been applied to a shaft 15 in the manner above described, the finishing block 22 is slowly advanced until it is brought into contact with the surface of said shaft, by proper adjustment of the sleeve 16, and as the tool is turned about the shaft and thefinishing of the surface thereof progresses, so as to advance the block 22along the shaft 15 and utilizes substantially the-entire area of the block in finishing said shaft. As the.

shaft-is turned down to a true surface, the block 22 is readjusted by further adjustment of the sleeve 16. In the case of re-. pairing or refinishing a shaft having a. flat spot, the abrading an undue amount of metal.

at the bearing point on the upright j or directly opposite" at the block 22, this high spot will be removed.

'Due to the manner of mounting the block 22, the latter may be removed andreplaced end for end andback andfront as the faces thereof become worn, and the corners, of said block are preferably rounded and, as will be understood, an abrading material having slow or fast cutting qualities may be employed as the condition of thesha-ft or its degree orhardness may require.

\Vhen the surface of the shaft 15 is worn or injured to such an extent as to render refinishing by an ordinary abrading stone or block 22 tedious and difficult, ametallic block 26 having a groove 26" is employed,

(see Fig. 5). This groove receives a removable cutting tool26' which is. made of metal. This tool has a curved cutting edge the handle 23. is. turned block 22 will not remove, Although, if, a high spot is present on the shaft either 26 which is highest at the central portion of the tool. The face 26 of this tool is parallel with the rear face 26 of the tool. Due to this construction, the longitudinal center of the cutting edge, when the tool is used, will first come into contact with the shaft. vided with a curved groove 26 the bottom of which is highest at the longitudinal center of the tool, so that shavings lodged in the groove will move towards the ends of the latter and be automatically dis-c charged. tool is secured to the plate 20 by screws 27 which extend through slots 28 inuthe. plate 20 and enter threaded aperturesin the block. Due to this construction, the block may be moved up and down. relativelyto the plate 20, this movement being limited by ends of the slots 28. The tool 26? is secured to the block by a threaded rod 31 which threads into the block at 32 and-is provided with a pointed end which enters a conical recess 33 on the under side of the tool. This rod extends through the hollow handle 23 and is provided at its lower .end with threads engaged by a lock nut 33 IVhen the lock nut is loosened, the rod 31 may be fed side wise in the handle.

Instead of using the tool shown. in Figs. 6 and 8, I may, when desired, employ the tool 35 shown in Fig. 7, this tool being made of hard metal and having'inclined teeth 36 This-tool will fit the groove 26 and maybe secured IILPOSI".

on one of its faces.

tion in the same manneras. the tool 261 From the foregoing, I believe that the construction, operation and advantages of the invention may beclearly understood. by those skilledin the art, and I am. aware that changes may be made in the details. disclosed without departing from the spirit of the invention as expressed in the claims.

What I claim and desire to. secure by Let? ters Patent is v 1. Ina tool for finishing.- shaftsandthe like, a body having spaced bearing faces for; a shaft, anadjustable member carried by the body having a bearing face thereon, a shaft engaging and finishing element. Supportedin said body independently of the shaft] engaged by said bearing faces, said element shaft engaging. and finishing element sup= ported in said body independentlyofthe The upper face of the tool is pro- The block 26 which carriesithis .shaft engaged by said bearing faces, said element having a plane surface contacting with the work, means for guiding and feeding the finishing element, and means independent of the guiding and feeding means for moving the finishing element ina direction to effect the utilization of substantially the entire area thereof, the last mentioned means constituting a handle facilitating the manipulation of the tool.

3. A tool as claimed in claim 2 characterized in that the adjustable member is resilient whereby the pressure exerted by a shaft on the first mentioned bearing. faces'may be varied. V

4. A tool as claimed in claim 2 characterized by the provision of means permitting the displacement of the adjustable member I for facilitating the application of a tool to a shaft.

'5. In a tool for finishing shafts and the like, a substantially U-shaped body designed to receive a shaft, spaced bearing faces on said body, an adjustable and displaceable shaft engaging member connected to said ment across said plate for utilizing substan- I a shaft engaging and finishing element ass0-- ciated with said body and having a straight surface contacting with the work, a feed and guide plate for said element, means for adjusting said feed and guide plate toward said shaft, and an adjustable handle carried by the body and engaged at its inner end with the finishing element for moving the latter across the feed and guide plate for utilizing substantially the entire area of theelementr 7. A tool as claimed in claim 1 characterized in that the finishing element is replaceable end for end and face for face.

8. In a tool for finishing shaftsand the like, a body including a plurality of angular members, one of said members constituting a bearing face for a shaft, a bearing block carried by another of said members, an

adjustable bearing member, avshaft engagin and finishing element, and feeding and gui ing means for said element carried by another of the body members In testimony whereof I hereunto aflix my signature.

MICHAEL D. MALONEY. 

